Quartz tube for chlorination of high-purity quartz sand
By setting protrusions and annular baffles on the inner wall of the quartz tube, combined with an inclined feed end and rotation, the problem of insufficient contact between quartz sand and chlorination gas was solved, achieving a more efficient chlorination effect and improving the purity of the quartz sand.
Patent Information
- Application Number
- CN202423105169.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-12-16
AI Technical Summary
In traditional chlorination roasting furnaces, the contact between quartz sand and chlorine gas is insufficient, resulting in unsatisfactory chlorination effects.
Multiple protrusions are arranged axially on the inner wall of the quartz tube, and annular baffles are installed at both ends. The quartz sand is turned up inside the tube and comes into full contact with the gas. The mixture is fully mixed by tilting the feed end and rotating.
This improves the contact efficiency between quartz sand and chlorination gas, enhances the chlorination effect, and ensures the purity of the quartz sand.
Smart Images
Figure CN223543001U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of high-purity quartz sand high-temperature chlorination purification technology, specifically relating to a quartz tube for high-purity quartz sand chlorination. Background Technology
[0002] High-purity silica sand is an important basic material widely used in many high-tech industries such as photovoltaic crucibles, semiconductor crucibles, high-purity glass, ultraviolet and deep ultraviolet sterilization, and fiber optic communications. High-purity silica sand requires extremely high purity; the inner layer silica sand for photovoltaic applications requires 4N8 or higher, while semiconductor crucibles require 5N or even 6N or higher. The alkali metals and transition metals in the silica sand must be present at extremely low levels.
[0003] To reduce the alkali and transition metal content in natural quartz sand, the most common method is chlorination roasting. Chlorine gas, hydrogen chloride gas, or a mixture of both are introduced into a chlorination roasting furnace and reacted with impurity ions in the quartz sand at high temperatures, thereby significantly reducing the impurities in the quartz sand.
[0004] Traditional chlorination roasting furnaces primarily consist of a quartz tube made of high-purity silica sand, with tapered ends. Quartz sand and chlorine / hydrogen chloride gas are introduced into the tube for heating. The silica sand, located at the bottom of the tube, slowly moves and reacts with the introduced gas, resulting in chlorination and purification. However, this chlorination method suffers from inadequate contact between the silica sand and the gas because the gas is inside the tube while the sand is at the bottom, leading to unsatisfactory chlorination results. Summary of the Invention
[0005] In order to overcome the shortcomings of the existing technology, this utility model proposes a quartz tube for chlorination of high-purity quartz sand.
[0006] The purpose of this utility model is achieved through the following technical solution: a quartz tube for chlorinating high-purity quartz sand, comprising a quartz tube, wherein the quartz tube includes, from left to right along the axial direction, a feed end, a heating zone, and a discharge end. Multiple protrusions are circumferentially fixed to the inner wall of the quartz tube. The protrusions are located at the position of the heating zone, and the length direction of the protrusions is consistent with the extension direction of the quartz tube axis. The protrusions extend from the inner wall of the quartz tube towards the quartz tube axis in the height direction. The end of each protrusion near the discharge end is fixedly connected to one end face of an annular baffle at the discharge end. The annular baffle at the discharge end is adapted to the inner wall of the quartz tube circumferentially. An annular baffle at the feed end is welded to the end of the feed end away from the heating zone, and the inner diameter of the annular baffle at the feed end is smaller than the inner diameter of the feed end.
[0007] Furthermore, multiple protrusions are uniformly fixed to the inner wall of the quartz tube along the circumference.
[0008] Furthermore, the length of the protrusion is equal to the length of the heating zone.
[0009] Furthermore, the quartz tube has an outer diameter of 200 mm, a wall thickness of 10 mm, and a length of 6.5 m.
[0010] Furthermore, the height of the protrusion is 40mm and the thickness is 10mm, the inner diameter of the annular baffle at the discharge end is 120mm, the outer diameter is 180mm and the wall thickness is 10mm, and the outer diameter of the annular baffle at the feed end is 200mm, the wall thickness is 10mm and the inner diameter is 50mm.
[0011] Furthermore, the outer diameter of the annular baffle at the feed end is aligned with the outer diameter of the feed end, and one end face of the annular baffle at the feed end is in close contact with the end face of the feed end that is away from the heating zone.
[0012] Furthermore, the end of each protrusion near the discharge end is welded to one end face of the annular baffle at the discharge end, and the end of each protrusion near the discharge end is in close contact with the aforementioned end face.
[0013] During chlorination, the quartz tube is tilted at a certain angle, raising the feed end. As the tube rotates inside, the quartz sand is constantly turned up, allowing it to fully contact the gas used for chlorination and improving the chlorination effect of the quartz sand.
[0014] Compared with the prior art, the present invention has the following beneficial effects:
[0015] (1) During the manufacturing process of quartz tube, a protrusion is provided on the inner wall with the same length extension direction as the quartz tube axis. The quartz sand is turned up by the protrusion in the quartz tube and fully mixed and reacted with the gas used for chlorination.
[0016] (2) Annular baffles are installed at both ends of the quartz tube to allow the quartz sand to accumulate to a certain thickness inside the tube, so that the quartz sand can fully contact the gas used for chlorination, while preventing the convection of the gas used for chlorination, which is beneficial for heat preservation.
[0017] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, preferred embodiments are given below, and detailed descriptions are provided in conjunction with the accompanying drawings. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the structure of a traditional quartz tube used for chlorination of high-purity quartz sand, where Figure (a) is the left view and Figure (b) is the front view.
[0019] Figure 2 This is a schematic diagram of the structure of a quartz tube for chlorination of high-purity quartz sand according to an embodiment of the present invention, wherein Figure (a) is a left view and Figure (b) is a front view.
[0020] Figure Labels
[0021] 1-Quartz tube, 2-Infeed end, 3-Heating zone, 4-Outfeed end, 5-Protrusion, 6-Outfeed end annular baffle, 7-Infeed end annular baffle. Detailed Implementation
[0022] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the following detailed description, in conjunction with preferred embodiments and accompanying drawings, will describe in detail the specific implementation, structure, features, and effects of a high-purity quartz sand chlorination tube proposed according to this utility model.
[0023] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0024] Traditional quartz tubes, such as Figure 1 As shown, it includes a quartz tube 1, which, from left to right along the axial direction, includes a feed end 2, a heating zone 3, and a discharge end 4.
[0025] An embodiment of a quartz tube for chlorinating high-purity quartz sand, such as... Figure 2 As shown, the device includes a quartz tube 1. The quartz tube 1 includes, from left to right along the axial direction, a feed end 2, a heating zone 3, and a discharge end 4. Eight protrusions 5 are uniformly welded circumferentially to the inner wall of the quartz tube 1. The protrusions 5 are located at the position of the heating zone 3, and the length of the protrusions 5 is equal to the length of the heating zone 3. The extension direction of the protrusions 5 in the length direction is consistent with the extension direction of the axis of the quartz tube 1. The protrusions 5 extend from the inner wall of the quartz tube 1 to the axis of the quartz tube 1 in the height direction. The end of each protrusion 5 near the discharge end 4 is welded to one end face of the discharge end annular baffle 6. The discharge end annular baffle 6 is adapted to the inner wall of the quartz tube 1 circumferentially. The end of the feed end 2 away from the heating zone 3 is welded with a feed end annular baffle 7, and the inner diameter of the feed end annular baffle 7 is smaller than the inner diameter of the feed end 2.
[0026] In this embodiment, the protrusion 5 has a height of 40mm and a thickness of 10mm, the annular baffle 6 at the discharge end has an inner diameter of 120mm, an outer diameter of 180mm, and a wall thickness of 10mm, the quartz tube 1 has an outer diameter of 200mm, a wall thickness of 10mm, and a length of 6.5m, and the annular baffle 7 at the feed end has an outer diameter of 200mm, a wall thickness of 10mm, and an inner diameter of 50mm.
[0027] In this embodiment, the eight protrusions 5 are welded one by one to the inner wall of the quartz tube 1. The welding length at both ends of the protrusions 5 is 100mm. After welding, the tubes are annealed.
[0028] Each protrusion 5 is welded to one end face of the annular baffle 6 at the discharge end 4, and the end of the protrusion 5 near the discharge end 4 is in close contact with the aforementioned end face of the annular baffle 6 at the discharge end. After welding, it is annealed.
[0029] The annular baffle 7 at the feed end is welded to the end of the feed end 2 away from the heating zone 3. The outer diameter of the annular baffle 7 at the feed end is aligned with the outer diameter of the feed end 2, and one end face of the annular baffle 7 at the feed end is in close contact with the end face of the feed end 2 away from the heating zone 3. After welding, it is annealed.
[0030] In other embodiments, the number of protrusions 5 may also be other.
[0031] As the quartz sand rotates inside the quartz tube 1, it is continuously turned up. After being blocked by the annular baffle, the quartz sand can accumulate to a certain thickness inside the quartz tube 1, which is beneficial for heat preservation. This allows it to fully contact the gas used for chlorination, thereby improving the chlorination effect of the quartz sand.
[0032] The high-purity quartz sand in this embodiment is chlorinated using the quartz tube for chlorination as follows:
[0033] (1) Place quartz tube 1 in a high-temperature chlorination furnace and raise the sand inlet end by 1.5-2°;
[0034] (2) Set the temperature to 1200℃, start the quartz tube rotation device, and heat;
[0035] (3) After the temperature reaches the set temperature, add quartz sand from the feed end of the quartz tube and introduce hydrogen chloride gas into the discharge end of the quartz tube. The quartz sand is agitated by the raised agitator, causing it to tumble and come into full contact with the hydrogen chloride gas. The chlorination time of the quartz sand in the quartz tube is 30 minutes. After 30 minutes, as the amount of quartz sand increases, it gradually overflows from the discharge end, overflowing through the annular baffle.
[0036] The following method is used to chlorinate quartz sand using a conventional quartz tube:
[0037] (1) Install a traditional quartz tube in a high-temperature chlorination furnace and raise the sand inlet end by 1.5-2°;
[0038] (2) Set the temperature to 1200℃, start the quartz tube rotation device, and heat.
[0039] (3) After the temperature reaches the set temperature, add quartz sand from the feed end of the quartz tube and introduce hydrogen chloride gas from the discharge end of the quartz tube. As the quartz tube rotates, the quartz sand flows slowly at the bottom of the quartz tube. The chlorination time of the quartz sand in the quartz tube is 30 minutes. The quartz sand gradually flows out from the discharge end.
[0040] Among them, traditional quartz tubes, such as Figure 1 As shown, it includes a quartz tube 1, a feed end 2, a heating zone 3, and a discharge end 4.
[0041] The composition of the quartz sand obtained by chlorination in this embodiment and by chlorination using a conventional quartz tube was analyzed, and the results are shown in the table below.
[0042]
[0043] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent changes, and alterations made by those skilled in the art to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model's technical solution shall still fall within the scope of the present utility model's technical solution.
Claims
1. A quartz tube for chlorinating high-purity quartz sand, characterized in that: The device includes a quartz tube, which, from left to right along the axial direction, comprises an inlet end, a heating zone, and an outlet end. Multiple protrusions are circumferentially fixed to the inner wall of the quartz tube. These protrusions are located at the heating zone, with their length direction aligned with the extension direction of the quartz tube's axis. The protrusions extend from the inner wall of the quartz tube towards its axis in the height direction. The end of each protrusion near the outlet end is fixed to one end face of an annular baffle at the outlet end. This annular baffle is circumferentially adapted to the inner wall of the quartz tube. An annular baffle is welded to the end of the inlet end away from the heating zone, and the inner diameter of this annular baffle is smaller than the inner diameter of the inlet end.
2. The quartz tube for chlorination of high-purity quartz sand according to claim 1, characterized in that: Multiple protrusions are uniformly fixed to the inner wall of the quartz tube along the circumference.
3. The quartz tube for chlorination of high-purity quartz sand according to claim 1, characterized in that: The length of the protrusion is equal to the length of the heating zone.
4. The quartz tube for chlorination of high-purity quartz sand according to claim 1, characterized in that: The quartz tube has an outer diameter of 200 mm, a wall thickness of 10 mm, and a length of 6.5 m.
5. The quartz tube for chlorination of high-purity quartz sand according to claim 4, characterized in that: The protrusion has a height of 40mm and a thickness of 10mm. The inner diameter of the annular baffle at the discharge end is 120mm, the outer diameter is 180mm, and the wall thickness is 10mm. The outer diameter of the annular baffle at the feed end is 200mm, the wall thickness is 10mm, and the inner diameter is 50mm.
6. The quartz tube for chlorination of high-purity quartz sand according to claim 1, characterized in that: The outer diameter of the annular baffle at the feed end is aligned with the outer diameter of the feed end, and one end face of the annular baffle at the feed end is in close contact with the end face of the feed end that is away from the heating zone.
7. The quartz tube for chlorination of high-purity quartz sand according to claim 1, characterized in that: Each protrusion is welded to one end face of the annular baffle at the discharge end at one end, and the end of each protrusion near the discharge end is in close contact with the aforementioned end face.